The diffusion rate of water in dilute clay dispersions depends on particle concentration, size, shape, aggregation and water-particle interactions. As nontronite clay particles magnetically align parallel to the magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here we study water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant 1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. After magnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measured between the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. A method was developed to measure water diffusion within the dispersion in the absence of a magnetic field (random clay orientation) as this is not possible with standard diffusion NMR. However, no significant difference in self-diffusion coefficient between random and aligned dispersions could be observed.

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BibTeX @article{Abrahamsson2015,author={Abrahamsson, Christoffer and Nordstierna, Lars and Nordin, M. and Dvinskikh, S. V. and Nyden, M.},title={Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusion},journal={Journal of Colloid and Interface Science},issn={0021-9797},volume={437},pages={205-210},abstract={The diffusion rate of water in dilute clay dispersions depends on particle concentration, size, shape, aggregation and water-particle interactions. As nontronite clay particles magnetically align parallel to the magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here we study water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant 1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. After magnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measured between the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. A method was developed to measure water diffusion within the dispersion in the absence of a magnetic field (random clay orientation) as this is not possible with standard diffusion NMR. However, no significant difference in self-diffusion coefficient between random and aligned dispersions could be observed.},year={2015},keywords={Nontronite clay; Magnetic alignment; Exfoliated clay; Anisotropic microstructure; Diffusion; Permeability; Bound water; NMR 1D imaging; Diffusion NMR},}

RefWorks RT Journal ArticleSR ElectronicID 208872A1 Abrahamsson, ChristofferA1 Nordstierna, LarsA1 Nordin, M.A1 Dvinskikh, S. V.A1 Nyden, M.T1 Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusionYR 2015JF Journal of Colloid and Interface ScienceSN 0021-9797VO 437SP 205OP 210AB The diffusion rate of water in dilute clay dispersions depends on particle concentration, size, shape, aggregation and water-particle interactions. As nontronite clay particles magnetically align parallel to the magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here we study water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant 1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. After magnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measured between the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. A method was developed to measure water diffusion within the dispersion in the absence of a magnetic field (random clay orientation) as this is not possible with standard diffusion NMR. However, no significant difference in self-diffusion coefficient between random and aligned dispersions could be observed.LA engDO 10.1016/j.jcis.2014.09.031LK http://dx.doi.org/10.1016/j.jcis.2014.09.031OL 30